2227 verified suppliers listed

Best ASNT Level III NDT Companies

ASNT Level III is the highest certification tier in the American Society for Nondestructive Testing's SNT-TC-1A personnel qualification standard, designating technicians qualified to establish procedures, interpret codes, and train and examine Level I and II personnel. NDT companies with ASNT Level III staff offer a higher tier of technical capability — their Level IIIs can develop and qualify inspection procedures for new applications, review and approve method procedures, and provide the technical authority required by quality management systems in aerospace, oil and gas, power generation, and heavy manufacturing. When your inspection requirements involve new procedures, fitness-for-service assessments, or technically complex applications, prioritizing companies with in-house Level III expertise ensures the technical foundation is sound.

Why these suppliers?

  • ASNT Level III personnel can develop, qualify, and approve inspection procedures — critical for customers who need custom procedures for non-standard geometries, new materials, or atypical defect types not covered by generic commercial procedures.
  • In-house Level III expertise means procedure reviews and technical dispositions can be completed without subcontracting, reducing turnaround time and maintaining a clear chain of technical authority for your quality records.
  • Companies maintaining ASNT Level III staff invest in ongoing technical training and method qualification — indicators of a quality culture that produces reliable inspection results and defensible documentation.

27 verified suppliers found

Miami, Florida5.0(5)

avindt.com Non Destructive testing PT MT UT ET IR RT VT NDT AOG Inspectios NDT Level III Representation

+1 786-683-3648Website
Houston, Texas

Providing NDT Consulting, Sales, and Service putting Quality 1st!

+1 713-665-9973Website
Hesperia, Michigan5.0(1)

In today’s fast-paced manufacturing world, quality control is paramount. At Draper NDT, we’re dedicated to ensuring the integrity and safety of your products. As a leading nondestructive testing (NDT) provider, we utilize advanced techniques to inspect and assess materials without causing damage.

+1 231-301-0761Website
Broussard, Louisiana4.0(4)

Contact Dynamic NDT, Inc. to schedule an inspection or heat treat service for your company or project in Florida Call us at 904-375-9074.

(337) 330-7086Website
Vancouver, Washington5.0(2)

We offer NDT and CWI Training Classes. Specializing in Online and In-Person Instruction, and NDT Level III Representation. Located in Vancouver, WA.

+1 360-702-8858Website
Vancouver, Washington

We offer NDT and CWI Training Classes. Specializing in Online and In-Person Instruction, and NDT Level III Representation. Located in Vancouver, WA.

Website
Houston, Texas5.0(8)

Global NDE Guru provides online NDT training, certification, education, inspection and NDT Level III consulting services across the field of non-destructive testing.

+1 877-237-2858Website
Houston, Texas4.5(13)

Hellier has been providing Nondestructive Testing training and consulting services for over 40 years. With training centers located in Houston, TX, and Anaheim, CA, our staff of NDT professionals stand ready to address your NDT needs.

+1 281-873-0980Website
Texas City, Texas

Providing pipeline integrity support to clientele utilizing highly qualified integrity specialists certified in NDT Level II, NDT Level III, AWS CWI, etc

Website
Tucson, Arizona

Level 3 Consultant / Instructor / Advisor Utilizing my 30+ years of experience in Nuclear Energy, Aerospace, Manufacturing and Military, I provide the following: NDT Program set up and management NDT Instructor / training / certifications Third party over-site / audits Written practice / quality manual Procedures / technique sheets Testing equipment recommendations Compliance with NAS 410 / SNT-TC-1A

Website
Hayward, California

Index Page (Home Page) for Level III NDT

+1 650-654-3601Website
Portland, Oregon5.0(3)

NDE Professionals, Inc. specializes in providing Nondestructive testing and Quality consulting to the Commercial Aerospace, Defense, Energy, Maritime, Petrochemical, Pulp and Paper, Semiconductor and Transportation Industries.

+1 503-287-5255Website
Bryan, Texas3.5(4)

Helping With Your Industrial Radiography Needs NDE Solutions, LLC is a mid-size NDT company specializing in Radiographic Testing (RT).  We take pride in our ...

+1 979-778-8783Website
Post Falls, Idaho

NDE Solutions provides NDT classes, Certification testing, NDT procedures, Auditing, and Level 3 Consulting services. My qualifications include ASNT Level III in MT, PT, VT, ET, RT, UT and ML, and Boeing D1-4426 Level III approval in MT, PT, RT, UT, ET.

Houston, Texas5.0

NDTCS, An ISO Certified Comp., offers NDT Testing, training, NDT certification, auditing & NDT inspection, & Level III Consulting services in the field of NDT.

+1 832-237-2800Website
Oak Creek, Wisconsin4.0(4)

Non-destructive testing services for multiple industries.

+1 414-483-9700Website
Allentown, Pennsylvania4.0(1)

The Nondestructive Testing Institute provides NDT training and Advanced NDT training for inspectors.

+1 610-820-4196Website
Tulsa, Oklahoma

Quality and NDT Solutions providing NDT services, NDT training, Level 3 support, AS9100 support and training. Tulsa Oklahoma, United States

(918) 895-1050Website

Frequently Asked Questions

What is ASNT Level III certification and what does it authorize?
ASNT Level III is the highest qualification level under ASNT SNT-TC-1A. A Level III is responsible for establishing NDT techniques and procedures, interpreting codes and standards, and designating the particular NDT methods, techniques, and procedures to be used. Level IIIs may also train and examine Level I and II personnel. ASNT Level III certification requires passing written examinations covering basic principles, specific methods, and practical applications, along with documented work experience in NDT.
When do I need a company with ASNT Level III staff?
You need Level III capability when your project requires developing new or non-standard inspection procedures, qualifying procedures on test specimens, interpreting conflicting indications that require code-level judgment, or providing technical oversight of a customer-specific NDT program. For routine inspection using established commercial procedures on standard applications, Level II technicians are typically sufficient. Level III involvement becomes important when the inspection task pushes beyond standard procedure coverage.
What is the difference between ASNT SNT-TC-1A and NAS 410?
Both are NDT personnel qualification standards, but they apply in different sectors. ASNT SNT-TC-1A is the dominant standard in industrial, oil and gas, and general manufacturing applications — it is employer-based, meaning qualification is administered and documented by the employer. NAS 410 (and its equivalent EN 4179) is the aerospace-specific standard, required by most aerospace prime contractors and mandated for Nadcap NDT accreditation. NAS 410 requires third-party examination administration and is more prescriptive about training hours, examination content, and Level III oversight responsibilities.

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